George W. Bush at ground zero three days after 9/11. Getty Images. Photo-4522934.60054 - Westport News

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George W. Bush at a signing of his book, "Decision Points."

George W. Bush at a signing of his book, "Decision Points."

George W. Bush at a signing of his book, "Decision Points." Photo-4522935.60054 - Westport News

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President Bush, surrounded by members of Congress, signs the Economic Stimulus Act of 2008, Wednesday, Feb. 13, 2008, in the East Room of the White House in Washington. Standing, from right are, House Minority Leader John Boehner of Ohio, Senate Minority Leader Mitch McConnell of Ky., and House Speaker Nancy Pelosi of Calif. (AP Photo/Ron Edmonds) less

President Bush, surrounded by members of Congress, signs the Economic Stimulus Act of 2008, Wednesday, Feb. 13, 2008, in the East Room of the White House in Washington. Standing, from right are, House Minority ... more

Photo: Ron Edmonds, ASSOCIATED PRESS

President Bush, surrounded by members of Congress, signs the... Photo-4522936.60054 - Westport News

FILE - In this Sept. 1, 1994 file photo, George W. Bush looks to the sky during a dove hunt in Hockley, Texas during his first Texas gubernatorial campaign. The White House has released a photo of President Barack Obama firing a gun, two days before he is set to travel to Minnesota to discuss gun control. It shows Obama shooting at clay targets on the range at Camp David, the presidential retreat in Maryland, where he says he engages in the sport "all the time." The image was released at a time when Obama is pushing a package of gun-control measures in response to the Newtown, Conn., school shooting. But the image of a U.S. president holding a gun is certainly nothing new. (AP Photo/File, David J. Phillip, File) less

FILE - In this Sept. 1, 1994 file photo, George W. Bush looks to the sky during a dove hunt in Hockley, Texas during his first Texas gubernatorial campaign. The White House has released a photo of President ... more

FILE - U.S. President George W. Bush, left, speaks with Spanish Prime Minster Jose Maria Aznar by telephone from the Oval Office of the White House in Washington with National Security Adviser Condoleezza Rice at right on Monday, March 10, 2003 as Bush and his top aides engaged in last-minute telephone diplomacy to world leaders in an uphill struggle to gain support for a U.N. resolution setting up war against Iraq. (AP Photo/Pablo Martinez Monsivais, File) less

FILE - U.S. President George W. Bush, left, speaks with Spanish Prime Minster Jose Maria Aznar by telephone from the Oval Office of the White House in Washington with National Security Adviser Condoleezza Rice ... more

FILE - In this July 5, 2012 file photo provided by the George W. Bush Presidential Center, former President George W. Bush and his wife, Laura Bush stop to talk with people who have lined the hallways of the Princess Marina Hospital in Gaborone, Botswana. The government spent nearly $3.7 million on former presidents in 2012, according to an analysis just released by the nonpartisan Congressional Research Service. That covers a pension, compensation and benefits for office staff, and other costs like travel, office space and postage. The costliest former president? George W. Bush, who clocked in last year at just over $1.3 million. (AP Photo/George W. Bush Presidential Center, Shealah Craighead, File) less

FILE - In this July 5, 2012 file photo provided by the George W. Bush Presidential Center, former President George W. Bush and his wife, Laura Bush stop to talk with people who have lined the hallways of the ... more

Photo: Shealah Craighead, Associated Press

FILE - In this July 5, 2012 file photo provided by the George W.... Photo-4445457.60054 - Westport News

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FILE - U.S. President George W. Bush gives a thumbs up as he visits the aircraft carrier USS Abraham Lincoln off the California coast on Thursday, May 1, 2003. Later in the day, he declared that major combat in Iraq was finished. (AP Photo/J. Scott Applewhite, File) less

FILE - U.S. President George W. Bush gives a thumbs up as he visits the aircraft carrier USS Abraham Lincoln off the California coast on Thursday, May 1, 2003. Later in the day, he declared that major combat in ... more

Photo: J. Scott Applewhite, Associated Press

FILE - U.S. President George W. Bush gives a thumbs up as he visits... Photo-4445458.60054 - Westport News

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Baylor university president Ken Starr, left, talks with former President George W. Bush and Laura before a second-round game against Florida State in the women's NCAA college basketball tournament Tuesday, March 26, 2013, in Waco, Texas. Baylor won 85-47. (AP Photo/Tony Gutierrez) less

Baylor university president Ken Starr, left, talks with former President George W. Bush and Laura before a second-round game against Florida State in the women's NCAA college basketball tournament Tuesday, ... more